Add awsproviderlint check to prefer RFC 3339 dates

[gdavison]

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Description

Add a check for RFC 3339 date formatting in attribute values

Flagged Provider Code

var createdDate time.Time
...
d.Set("created_date", createdDate.String())

var createdDate time.Time
...
d.Set("created_date", Format(time.ANSIC))

Passing Provider Code

var createdDate time.Time
...
d.Set("created_date", createdDate.Format(time.RFC3339))

[github-actions]

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[github-actions]

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